11.Ferro Frit 3225 M.P./°F 1650 Silica/Alumina ratio: 13.5:1 Equivalent Molecular Weight: 1232.779 Molecular Formula of Ferro Frit 3225: Na2O 0.879 Al2O3 0.991 SiO2 13.340 CaO 0.055 B2O3 3.893 MgO 0.066 Percentage Analysis 64.99 % SiO2 8.19 % Al2O3 4.42 % Na2O 0.22 % MgO 0.25 % CaO 21.93 % B2O3 _____________________ 100 % TOTAL Comments: 5.0 x 10-6 coefficient of expansion (50-450° C)